Malicious PDF — malware analysis report

Static analysis result for SHA-256 af308120d2c0d651…

MALICIOUS

PDF

92.2 KB Created: 2021-07-25 20:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 099f27070fbcd2b744aecd0dbe8ba0c6 SHA-1: fbe9070070442ed060086ea7a5be2d3e730b917d SHA-256: af308120d2c0d651e78dfc0cb869b4aa9a589b4a29062ae9a84462bb05081356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures that attempt to trick users into downloading further payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c233ce2f276---donobaputibigaveranul.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7vdlp2gq2nphq25h7pnkacmaid/potikomirev.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7aa4ad46f422d6dd29840c7dcef20ad3/zatatoviremijosolo.pdf
    • http://serramentisiciliano.it/userfiles/files/94671137753.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607836218054b.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8nsfc507va42ttn4g5sd3jlm96/46146561399.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5bb9e97cb5af7e9145e0aed7368e79dc/jawog.pdf
    • http://fouladsazanco.com/Upload/file/bulenad.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84748ee36c---57299935998.pdf
    • https://masukpt2.com/contents//files/40733413962.pdf
    • http://dientrotiendathc.com/media/ftp/file/serosexetuwisi.pdf
    • https://datajournonepal.org/files/94145527401.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/39091945111.pdf
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42806679598.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/sosexitawewosuzuxeri.pdf
    • http://xiaohecollege.com/d/files/zatiropinedofexoroma.pdf
    • http://drivingschool-brno.eu/files/54351708676.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55a3a5793f---jogumajevexof.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f550294931d---17687035587.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160761b4034b7f---fimafabarebarudu.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hkd9grt8fcvhsuhmob2dk3up0n/98314760802.pdf
    • https://kipass.fr/userfiles/file/13636116846.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/340b0bf5df670ffb158a5c588b483196/87534491913.pdf
    • https://nnkcreations.com/userfiles/file/marinakotolavasib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=factory+data+reset+iphone+11+buttons
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 16792 bytes
font_01_sfnt_off00011b1d.bin
99569602314830aeadee10026142e66192f2e34c63add7cae1c092177925ab0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 17512 bytes
font_02_sfnt_off000148ab.bin
821be4d681e9b94ce32eb89c95fe3cbc5c96c45a57ffe51435b6e951889f71ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x148AB 10948 bytes